Display apparatus

Abstract

A display apparatus which displays an image to an observer by using an optical modulation device which performs optical modulation in accordance with inputted image data, comprises a plurality of light emitters configured to emit different color light beams whose light emission quantities are adjustable, and a light intensity adjustment control portion configured to individually adjust and control the light emission quantities of the respective color light beams emitted by the plurality of light emitters. The light intensity adjustment control portion can change a light emission quantity of at least one color light beam to a light emission quantity smaller than the light emission quantities of the respective color light beams from the plurality of light emitters when a white image having a maximum brightness which can be displayed is displayed to an observer.

What is claimed is:  
     
         1 . A display apparatus which displays an image to an observer by using an optical modulation device which performs optical modulation in accordance with inputted image data, comprising: 
 a plurality of light emitters configured to emit different color light beams whose light emission quantities are adjustable; and    a light intensity adjustment control portion configured to individually adjust and control the light emission quantities of the respective color light beams emitted by the plurality of light emitters,    the light intensity adjustment control portion being able to change a light emission quantity of at least one color light beam to a light emission quantity smaller than the light emission quantities of the respective color light beams from the plurality of light emitters when a white image having a maximum brightness which can be displayed is displayed to an observer.    
     
     
         2 . The apparatus according to  claim 1 , further comprising an optical modulation data change portion configured to obtain optical modulation data by converting a size of the inputted image data, and input the converted optical modulation data to the optical modulation device, wherein 
 in order to prevent a brightness of an image based on a predetermined size of image data observed by an observer from being changed,    the optical modulation data change portion changes a conversion method performed by itself, and    the light intensity adjustment control portion changes the light emission quantities of the respective color light beams emitted by the plurality of light emitters.    
     
     
         3 . The apparatus according to  claim 1 , further comprising an operation panel configured to command adjustment of the light emission quantities of the respective color light beams emitted from the plurality of light emitters by an operator, wherein 
 the light intensity adjustment control portion individually adjusts and controls the light emission quantities of the respective color light beams emitted from the plurality of light emitters in accordance with an adjustment command from the operation panel.    
     
     
         4 . The apparatus according to  claim 3 , wherein the light intensity adjustment control portion individually adjusts and controls the light emission quantities of the respective color light beams so as to adjust the white balance of the color light beams emitted from the plurality of light emitters when adjusting the light emission quantities in accordance with the adjustment command.  
     
     
         5 . The apparatus according to  claim 2 , further comprising an image analysis portion configured to analyze the inputted image data and output a signal corresponding to an analysis result, wherein 
 the optical modulation data change portion changes a conversion method in accordance with an output signal from the image analysis portion, and    the light intensity adjustment control portion changes the light emission quantities in accordance with an output signal from the image analysis portion.    
     
     
         6 . The apparatus according to  claim 5 , wherein the image analysis portion detects a maximum value of the inputted image data and outputs it as an analysis result.  
     
     
         7 . The apparatus according to  claim 6 , wherein 
 the different color light beams are red, blue and green,    the inputted image data is composed of data corresponding to the respective color light beams,    the image analysis portion outputs respective analysis results of the data corresponding to the respective color light beams,    the optical modulation data change portion changes the conversion method for each color light beam in accordance with the maximum value for each color light beam detected by the image analysis portion, and    the light intensity adjustment control portion changes the light emission quantity of each color light beam in accordance with the conversion method for each color light beam.    
     
     
         8 . The apparatus according to  claim 6 , wherein 
 the different color light beams are red, blue and green,    the inputted image data is composed of data corresponding to the respective color light beams,    the image analysis portion determines the data corresponding to each of the color light beams as all data, and outputs an analysis result concerning the all data,    the optical modulation data change portion changes the conversion method for each color light beam in accordance with a maximum value concerning the all data detected by the image analysis portion, and    the light intensity adjustment control portion changes the light emission quantity of each color light beam in accordance with the conversion method.    
     
     
         9 . The apparatus according to  claim 5 , wherein the image analysis portion generates a histogram of the inputted image data, and outputs it as an analysis result.  
     
     
         10 . The apparatus according to  claim 5 , wherein the light intensity adjustment control portion changes the light emission quantity of each color light beam emitted from the plurality of light emitters every time the inputted image data is changed.  
     
     
         11 . The apparatus according to  claim 5 , wherein 
 the optical modulation data change portion comprises a plurality of lookup tables as a predetermined conversion method in which a relationship between the image data and the optical modulation data is preset, and    the optical modulation data change portion selects one of the plurality of lookup tables in accordance with an output from the image analysis portion.    
     
     
         12 . The apparatus according to  claim 1 , wherein the light emitter comprises a plurality of light emitting diodes which emit light beams having at least one color, 
 the light intensity adjustment control portion causes the plurality of light emitting diodes to perform pulse light emission with different timings, and    the light intensity adjustment control portion performs light intensity adjustment by changing respective light emission quantities of the light emitting diodes which emit light beams with different timings.    
     
     
         13 . The apparatus according to  claim 12 , wherein the light intensity adjustment control portion controls supply currents to the light emitting diodes when performing the light intensity adjustment by changing the light emission quantities of the light emitting diodes.  
     
     
         14 . The apparatus according to  claim 12 , wherein the light intensity adjustment control portion controls a pulse light emission time in which the light emitting diodes are caused to emit light beams when performing the light intensity adjustment by changing the light emission quantities of the light emitting diodes.  
     
     
         15 . The apparatus according to  claim 12 , further comprising: 
 a light source holding portion configured to arrange the plurality of light emitting diodes in a ring form, the light intensity adjustment control portion controlling the plurality of light emitting diodes to sequentially perform pulse light emission in accordance with an arrangement order that the plurality of light emitting diodes are held in the light source holding portion; and    a drive control portion configured to drive and control a light leading member to rotate along the light emitting diodes arranged in the ring form in order to lead the respective light beams at the time of sequential pulse light emission of the light emitting diodes to the optical modulation device by the light leading member.    
     
     
         16 . The apparatus according to  claim 1 , further comprising a projection optical system configured to magnify and project light beams optically modulated by the optical modulation device.  
     
     
         17 . A display apparatus which displays an image to an observer by using an optical modulation device which performs optical modulation in accordance with inputted image data, comprising: 
 a plurality of light emitters for emitting different color light beams whose light emission quantities are adjustable; and    light intensity adjustment control means for individually adjusting and controlling the light emission quantities of the respective color light beams emitted by the plurality of light emitters,    the light intensity adjustment control means being able to change a light emission quantity of at least one color light beam to a light emission quantity smaller than the light emission quantities of the respective color light beams from the plurality of light emitters when a white image having a maximum brightness which can be displayed is displayed to an observer.